This Add-on adds the &html5=1 option to YouTube-URLs during page load. This happens without any user interaction, like clicking a button. Simply turn this Add-on on or off, whether you want to use it or not.

Play online videos with subtitles. When you go to any video streaming sites. This will allow you to play with subtitles. Watch movies TV series available on other sites with your customized subtitles. More on http://www.ideawide.com/video-grabber/